Facebook/Twitter registration link (1 post)

I have searched with no luck. I am looking for a plugin that that will allow a person to register on my wordpress site from a link to Facebook or Twitter.

In other words, when a person clicks the "REGISTER" link, the page that comes up will give them the choice of registering manually or clicking on an ico link to either Facebook or Twitter that will automatically register them on my site using their registration info from Facebook or Twitter.